#40D9FF#40D9FF

#40D9FF is a very light, vivid cyan. Relative luminance 0.579; OKLCH L 82.3% C 0.134 H 218.7°. Best body text is #000000 at 12.59:1 contrast (WCAG AA passes).

Color values

HEX	#40D9FF
RGB	rgb(64, 217, 255)
HSL	hsl(192, 100%, 63%)
HSV	hsv(192, 75%, 100%)
CMYK	cmyk(74.9%, 14.9%, 0%, 0%)
CIE-LAB	lab(80.70, -27.20, -29.86)
CIE-LCH	lch(80.70, 40.39, 227.67°)
OKLab	oklab(82.27% -0.1043 -0.0835)
OKLCH	oklch(82.27% 0.134 218.7)
XYZ	xyz(44.9696, 57.9303, 103.3999)
Luminance	0.5794 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#40D9FF #FF6640

analogous

#40FFC5 #40D9FF #407AFF

triadic

#40D9FF #FF40D9 #D9FF40

tetradic

#40D9FF #C540FF #FF6640 #7AFF40

square

#40D9FF #C540FF #FF6640 #7AFF40

split-complementary

#40D9FF #FF407A #FFC540

monochromatic

#009DC5 #03CDFF #40D9FF #7DE5FF #BAF1FF

Accessibility & contrast

On white

1.67

#40D9FF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

12.59

#40D9FF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #40D9FF

12.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##40D9FF	#FFFFFF	#000000	##000000
##40D9FF	1.00	1.67	12.59	12.59
#FFFFFF	1.67	1.00	21.00	21.00
#000000	12.59	21.00	1.00	1.00
##000000	12.59	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#C1D3FF

Deuteranopia (green-blind)

#A7C0FF

Tritanopia (blue-blind)

#00E6E5

Achromatopsia (no color)

#C8C8C8

Design tokens & code

CSS

--color: #40d9ff;
/* rgb */ color: rgb(64, 217, 255);
/* oklch */ color: oklch(82.3% 0.134 218.7);

Tailwind

colors: {
  custom: {
    50: '#90e5ff',
    500: '#40d9ff',
    950: '#000000',
  },
}

SCSS

$custom: #40d9ff;
$custom-light: #90e5ff;
$custom-dark: #000000;

JSON

{
  "hex": "#40d9ff",
  "rgb": {
    "r": 64,
    "g": 217,
    "b": 255
  },
  "hsl": {
    "h": 191.937,
    "s": 100,
    "l": 62.549
  },
  "oklch": {
    "l": 0.82266,
    "c": 0.13359,
    "h": 218.7
  },
  "luminance": 0.57936
}

Semantic roles & 50–950 ramp

primary

#40D9FF

secondary

#C14222

accent

#2E00E6

background

#FCFEFF

surface

#F5FCFF

border

#CFD5D7

text

#0F1518

muted

#808486

Preview Lab

Preview with #40D9FF

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →